US5093052A - Method of controlling injection molding machine with hydraulic loads - Google Patents

Method of controlling injection molding machine with hydraulic loads Download PDF

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Publication number
US5093052A
US5093052A US07538382 US53838290A US5093052A US 5093052 A US5093052 A US 5093052A US 07538382 US07538382 US 07538382 US 53838290 A US53838290 A US 53838290A US 5093052 A US5093052 A US 5093052A
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US
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Grant
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Prior art keywords
motor
value
desired
hydraulic
injection molding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07538382
Inventor
Ernst Wurl
Helmut Schreiner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo (SHI) Demag Plastics Machinery GmbH
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Vodafone GmbH
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/82Hydraulic or pneumatic circuits
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/82Hydraulic or pneumatic circuits
    • B29C2045/824Accumulators

Abstract

An injection molding machine for manufacturing plastic moldings contains a plurality of hydraulic loads for individual subassemblies including a closing unit, an injection unit, an ejector and cores. A plurality of the pumps are respectively connected to the hydraulic loads. At least one alternating-current servomotor is provided for driving the pumps. In a method of controlling hydraulic drives of the foregoing machine, the measured value of a subassembly is detected and compared with a desired value; any deviation detected thereby is converted into a desired velocity value. The speed of rotation of an associated motor is then adjusted, via a servodrive module, in response to the mentioned desired velocity value.

Description

BACKGROUND AND SUMMARY OF THE INVENTION

The present invention relates to an injection molding machine for manufacturing plastic moldings and including a plurality of hydraulic loads for individual subassemblies, and also to a method of controlling hydraulic drives of the foregoing type of injection molding machine.

From EP 0,201,610 A1 an injection molding machine is known in which a servomotor drives a toggle-lever closing unit. In that case, the motor acts via a chain on the nut of a ball spindle.

With that construction, a linear movement is produced mechanically by rotation, with the disadvantage of unavoidable wear of the mechanical parts. In addition, the speed of rotation of the drive unit is limited in order to avoid damage to the ball-spindle system and in order to prevent loud operating noises.

From Federal Republic of Germany OS 3,731,021 an injection molding machine with hydraulic loads of individual subassemblies is known. The hydraulic systems of such machines ordinarily have a central pressure-producing station in which an electric motor drives a fixed-displacement pump and the pressure and volume control of the hydraulic system is effected by valves.

In addition to the annoyance by noise due to the continuous operation of motor and pump, such drives of injection molding machines have the disadvantage of consuming a large amount of energy. In addition, the control behavior of these hydraulically operated injection molding machines is also relatively sluggish, even upon the use of servovalves and control pumps.

It is an object of the present invention to provide hydraulic drives and a method of controlling said drives in injection molding machines which, while being of compact construction, move the individual subassemblies with strong power, rapidly and in noise-reducing fashion, as well as with less consumption of energy.

The foregoing object is achieved by an injection molding machine for manufacturing plastic moldings in accordance with the invention. Such machine comprises a plurality of hydraulic loads for individual subassemblies including a closing unit, an injection unit, an ejector and cores. A plurality of pumps are respectively connected to said hydraulic loads; and at least one alternating-current servomotor is provided for driving the pumps.

In a method for controlling hydraulic drives of the foregoing injection molding machine, a measured value of a subassembly is detected. Such measured value is compared with the desired value, and any deviation detected thereby is converted into a desired velocity value. The speed of rotation of an associated motor is then adjusted, via a servodrive module, in response to the desired velocity value.

The individual loads are connected directly to a pump which is driven by a servomotor. A uniform drive concept is produced since the drives of all subassemblies are driven hydraulically regardless of whether they perform a main function or a secondary function.

The energy required for driving the hydraulic loads is produced only when required since the servomotor can operate in a so-called stop-and-go mode. The work energy produced by the pumps is fed in simple fashion to the loads by pipe lines, without intermediate switching of hydraulic control elements such as directional or relay valves, and converted into linear motion.

Installation of these drives in existing drive systems is possible without any particular expense.

The pre-tensioning pressure required in the closed hydraulic system can be maintained in a structurally simple manner by pressure-maintaining pumps or by standardized accumulators. The transmission of force from the producer to the load is effected with extremely high speed and is not limited by mechanical parts. The result is a cycle time which is much shorter than that of electrical-mechanical injection molding machines.

The hydraulic system is almost free of wear. The mechanical parts used have self lubrication as a result of the fluid used, i.e. oil. In addition to this, hydraulic systems are not as strong as a mechanical system, so that extreme load peaks are avoided. Nevertheless, these hydraulic systems are of high rigidity which permit reproduceable values with respect to the path or force. This advantage is further increased by the direct transfer of power within the closed hydraulic circuit and therefore without the disturbing intermediate switching of valves and the like.

The number of structural parts necessary for the loads of the injection molding machine can be reduced in advantageous fashion or, for the same number, can be replaced by simpler parts. Thus a servomotor including a subcontrol circuit can be replaced by simple switchable clutches which are arranged between motor and pump. The advantage of the pump size which is adapted to the subassembly is retained thereby.

Instead of the switchable couplings, more than one pump can, in another advantageous arrangement, be connected to a servomotor.

By the use of variable displacement pumps, the volumetric flows of the loads of the individual subassemblies can be freely adjusted, both in volume and in direction. The control system of these standardized variable displacement pumps is of simple construction and is adapted to the control system of the servomotors.

The high dynamics which the hydraulics have as a result of the system is further supported by the procedure upon the regulation of the injection molding machine of the invention. Within a sub-system, namely a position or force control circuit, the measured values ascertained on the corresponding subassembly are controlled and converted into a velocity value. Within the control circuit of the drive motor, this velocity value is used as a desired value and is compared directly with the actual speed of rotation of the pump shaft and adjusted by a servovalve module in case of deviation.

This method of control permits a rapid analog response to changes in the actual behavior of the subassemblies.

BRIEF DESCRIPTION OF THE DRAWING FIGURES

Examples of the invention are shown in the accompanying Figures, in which:

FIG. 1 is a partially schematic view of an injection molding machine for manufacturing plastic moldings in accordance with the invention;

FIG. 2 is a view similar to FIG. 1 but showing a different embodiment of the invention;

FIG. 3 is a view also similar to FIG. 1 but again showing a different embodiment of the invention; and

FIG. 4 illustrates a feedback control system for adjusting the speed of a servomotor in response to measured values from a subassembly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIGS. 1 to 3 show an injection unit 12, as well as a closing unit 19 with the corresponding hydraulic loads, the piston/cylinder units 21, 22. A pressure accumulator 90 is connected to the closed hydraulic system.

In FIGS. 1 and 2 the hydraulic loads 21, 22 are foreconnected with the fixed-displacement pumps 311 and 321.

In FIG. 1, the fixed-displacement pumps 311 and 321 are connected independently of each other to the motors 41 and 42.

In FIG. 2 the fixed-displacement pumps 311 and 321 are connected to the motor 48 via structures 61 and 62 and a power take-off 70. The clutches 61, 62 can be switched from the outside by a clutch control 69.

In FIG. 3 a motor 48 is provided which is connected by the power take-off 70 to variable displacement pumps 312 and 322.

FIG. 4 shows the fixed-displacement pump 311 which is connected to a hydraulic load 20, namely the piston/cylinder unit 21, which moves the closing unit, which is developed as toggle lever 11. This position of the closing unit 11 is detected by measurement elements 50, namely the position recorder 51.

The position value x, after detection, is fed to the position control circuit 81, compared with the desired value w, and delivered as speed value v. This value v is fed as a desired speed value to a speed control circuit 82 and compared with the existing speed of rotation of the motor 41 and, in the event that it differs, controlled by means of a servodrive module 49.

It should be understood that the preferred embodiments and examples described are for illustrative purposes only and are not to be construed as limiting the scope of the present invention which is properly delineated only in the appended claims.

Claims (3)

What is claimed is:
1. A method of controlling hydraulic drives of an injection molding machine for manufacturing plastic moldings, said machine comprising a plurality of hydraulic loads for individual subassemblies including a closing unit, an injection unit, an ejector and cores, said method comprising the steps of:
detecting a measured value of a parameter at a subassembly;
comparing said measured value with a desired value of said parameter;
converting any difference deviation resulting from said comparing between said measured value and said desired value of said parameter into a desired velocity value; and
adjusting a rotational speed of a motor, in response to said desired velocity value input into a servodrive apparatus associated with said motor, said motor controlling said hydraulic loads, to obtain said desired value of said parameter at said subassembly.
2. A method according to claim 1, wherein said step of adjusting the rotational speed of said motor comprises comparing an actual rotational speed of said motor with a desired rotational speed of said motor and controlling the rotational speed of said motor in response to the result of said comparison.
3. The method according to claim 1, wherein said parameter at said subassembly is selected from the group consisting of position and force.
US07538382 1989-06-14 1990-06-14 Method of controlling injection molding machine with hydraulic loads Expired - Lifetime US5093052A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3919823 1989-06-14
DE19893919823 DE3919823C3 (en) 1989-06-14 1989-06-14 Injection molding machine with hydraulic consumers

Publications (1)

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US5093052A true US5093052A (en) 1992-03-03

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US07538382 Expired - Lifetime US5093052A (en) 1989-06-14 1990-06-14 Method of controlling injection molding machine with hydraulic loads

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US (1) US5093052A (en)
EP (1) EP0403041B2 (en)
DE (1) DE3919823C3 (en)
ES (1) ES2058769T5 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5482662A (en) * 1992-11-27 1996-01-09 Nissei Plastic Industrial Co., Ltd. Control method for injection molding machines
US5613574A (en) * 1995-06-23 1997-03-25 Melanson; Charles J. Ladder mounted tool holster and parts tray
US5673885A (en) * 1995-12-27 1997-10-07 Pham; Paul Paint tray for a stepladder
US6089849A (en) * 1998-02-27 2000-07-18 Van Dorn Demag Corporation Hybrid injection molding machine
US6379119B1 (en) * 1995-05-16 2002-04-30 Globemag L-P Hybrid electric and hydraulic actuation system
US20040093097A1 (en) * 2002-11-07 2004-05-13 Chiharu Nishizawa Power shut-off method for injection molding machine
US20050258795A1 (en) * 2004-05-18 2005-11-24 Choi Christopher W Energy management apparatus and method for injection molding systems
CN100424361C (en) 2006-03-07 2008-10-08 太原理工大学 Closed electrohydraulic controlling system
WO2010144993A1 (en) 2009-06-19 2010-12-23 Husky Injection Molding Systems Ltd. Kinematic control in a hydraulic system
WO2011075813A1 (en) * 2009-12-23 2011-06-30 Husky Injection Molding Systems Ltd. Injection molding system having a digital displacement pump
US20130167951A1 (en) * 2011-12-30 2013-07-04 Bhdt Gmbh Hydraulic drive for a pressure booster

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2788675B2 (en) * 1990-11-06 1998-08-20 住友重機械工業株式会社 Mold opening and closing control device
DE4200163A1 (en) * 1992-01-07 1993-07-08 Juergen Roeper Automatic regulating system for injection mould closure pressure - has controller which regulates curve of mould closure pressure against time according to corresponding curve of internal mould pressure
DE4335403C1 (en) * 1993-10-18 1994-12-15 Karl Hehl Hydraulic device
DE4335328A1 (en) * 1993-10-18 1995-04-20 Battenfeld Gmbh Hydraulic operating system for injection molding machines
DE19517582C2 (en) * 1995-05-05 1998-08-20 Mannesmann Ag Drive for the injection and plasticizing a plastic injection molding
DE19524395C1 (en) * 1995-07-04 1996-10-10 Battenfeld Gmbh Hydraulic operating system for plastic injection processing machines
DE19701671B4 (en) * 1997-01-18 2008-02-14 Bosch Rexroth Aktiengesellschaft Drive device for a hydraulic pump and method for supplying at least one a variable power requirement having consumer with hydraulic energy
DE10013194B4 (en) * 2000-03-17 2005-02-24 Festo Ag & Co.Kg driving device
DE10305134B4 (en) * 2003-02-07 2006-10-26 Brueninghaus Hydromatik Gmbh Hydrostatic drive
DE102007007005A1 (en) 2007-02-08 2008-08-14 Robert Bosch Gmbh Electro-hydraulic control arrangement
DE102007011442A1 (en) 2007-03-08 2008-09-11 Robert Bosch Gmbh closing unit
DE102008019501A1 (en) 2008-04-17 2009-10-22 Robert Bosch Gmbh Electro-hydraulic control arrangement
DE202010017961U1 (en) 2010-09-20 2013-04-17 Bystronic Laser Ag Control system for hydraulic press brake
DE102011010218A1 (en) 2011-02-03 2012-08-09 Robert Bosch Gmbh Method for regulating pressure of fluids delivered by servo pump of electrohydraulic drive system for injection molding machine, involves determining actual pressure from drive moment and time change of rotor position of electric motor
DE102014114822A1 (en) 2014-10-13 2016-04-14 Dr. Boy Gmbh & Co. Kg hydraulic injection molding machine

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US3721512A (en) * 1970-10-22 1973-03-20 Cincinnati Milacron Inc Plastication control system for injection molding machines
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US4565511A (en) * 1983-03-19 1986-01-21 Krauss-Maffei Aktiengesellschaft Apparatus for producing articles from two or more flowable synthetic resin reactants

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FR1518913A (en) * 1967-02-15 1968-03-29 Puma Soc Device for controlling a double-acting cylinder or the like
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US4120922B1 (en) * 1958-05-09 1996-07-16 Jerome H Lemelson Method for molding
US4120922A (en) * 1958-05-09 1978-10-17 Lemelson Jerome H Method for molding
US3422648A (en) * 1961-10-02 1969-01-21 Jerome H Lemelson Extrusion apparatus
US3698846A (en) * 1970-04-30 1972-10-17 Indramat Gmbh Balancing and adjusting arrangement for an extrusion mandrel
US3721512A (en) * 1970-10-22 1973-03-20 Cincinnati Milacron Inc Plastication control system for injection molding machines
US3893792A (en) * 1973-04-06 1975-07-08 Bbf Group Inc Controller for injection molding machine
US4257755A (en) * 1974-06-25 1981-03-24 Lemelson Jerome H Molding system and method
US4565511A (en) * 1983-03-19 1986-01-21 Krauss-Maffei Aktiengesellschaft Apparatus for producing articles from two or more flowable synthetic resin reactants

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5482662A (en) * 1992-11-27 1996-01-09 Nissei Plastic Industrial Co., Ltd. Control method for injection molding machines
US6379119B1 (en) * 1995-05-16 2002-04-30 Globemag L-P Hybrid electric and hydraulic actuation system
US5613574A (en) * 1995-06-23 1997-03-25 Melanson; Charles J. Ladder mounted tool holster and parts tray
US5673885A (en) * 1995-12-27 1997-10-07 Pham; Paul Paint tray for a stepladder
US6089849A (en) * 1998-02-27 2000-07-18 Van Dorn Demag Corporation Hybrid injection molding machine
US6299427B1 (en) 1998-02-27 2001-10-09 Van Dorn Demag Corporation Hybrid injection molding machine
US20040093097A1 (en) * 2002-11-07 2004-05-13 Chiharu Nishizawa Power shut-off method for injection molding machine
US6999823B2 (en) * 2002-11-07 2006-02-14 Nissei Plastic Industrial Co., Ltd. Power shut-off method for injection molding machine
US20050258795A1 (en) * 2004-05-18 2005-11-24 Choi Christopher W Energy management apparatus and method for injection molding systems
US7176648B2 (en) 2004-05-18 2007-02-13 Husky Injection Molding Systems Ltd. Energy management apparatus and method for injection molding systems
CN100424361C (en) 2006-03-07 2008-10-08 太原理工大学 Closed electrohydraulic controlling system
EP2443348A4 (en) * 2009-06-19 2013-03-27 Husky Injection Molding Kinematic control in a hydraulic system
US9038526B2 (en) * 2009-06-19 2015-05-26 Husky Injection Molding Systems Ltd. Kinematic control in a hydraulic system
US20120090310A1 (en) * 2009-06-19 2012-04-19 Husky Injection Molding Systems Ltd. Kinematic control in a hydraulic system
EP2443348A1 (en) * 2009-06-19 2012-04-25 Husky Injection Molding Systems S.A. Kinematic control in a hydraulic system
CN102639881A (en) * 2009-06-19 2012-08-15 赫斯基注塑系统有限公司 Kinematic control in a hydraulic system
WO2010144993A1 (en) 2009-06-19 2010-12-23 Husky Injection Molding Systems Ltd. Kinematic control in a hydraulic system
CN102639881B (en) * 2009-06-19 2015-07-22 赫斯基注塑系统有限公司 Kinematic control in a hydraulic system
CN102712123A (en) * 2009-12-23 2012-10-03 赫斯基注塑系统有限公司 Injection molding system having a digital displacement pump
US8641399B2 (en) 2009-12-23 2014-02-04 Husky Injection Molding Systems Ltd. Injection molding system having a digital displacement pump
CN102712123B (en) 2009-12-23 2014-10-29 赫斯基注塑系统有限公司 Injection molding system having a digital displacement pump
WO2011075813A1 (en) * 2009-12-23 2011-06-30 Husky Injection Molding Systems Ltd. Injection molding system having a digital displacement pump
US20130167951A1 (en) * 2011-12-30 2013-07-04 Bhdt Gmbh Hydraulic drive for a pressure booster

Also Published As

Publication number Publication date Type
DE3919823C2 (en) 1994-07-28 grant
EP0403041B1 (en) 1994-08-31 grant
DE3919823C3 (en) 1998-04-09 grant
DE3919823A1 (en) 1990-12-20 application
ES2058769T3 (en) 1994-11-01 grant
EP0403041A2 (en) 1990-12-19 application
EP0403041A3 (en) 1991-07-24 application
ES2058769T5 (en) 2001-05-01 grant
EP0403041B2 (en) 2001-03-21 grant

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